Choose the correct answer.

1 It’s difficult ___ chess well.

a playing b to playing c to play

2 I’m determined ___ my exams.

a passing b to passing c to pass

3 I apologize ___ at you.

a shouting b for shouting c for shout

4 We’re looking forward ___ on holiday.

a going b to going c to go

5 It’s dangerous ___ in that river.

a swimming b to swimming c to swim